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Lung cancer is the most diagnosed and deadliest cancer worldwide, with 2.2 million cases in 2020 resulting in 1.8 million deaths. [3] Lung cancer is rare in those younger than 40; the average age at diagnosis is 70 years, and the average age at death 72. [2] Incidence and outcomes vary widely across the world, depending on patterns of tobacco use.
Small-cell lung carcinoma (SCLC) has long been divided into two clinicopathological stages, termed limited stage (LS) and extensive stage (ES). [8] The stage is generally determined by the presence or absence of metastases, whether or not the tumor appears limited to the thorax, and whether or not the entire tumor burden within the chest can feasibly be encompassed within a single radiotherapy ...
Cannonball metastases are classically seen in renal cell carcinoma, [5] also seen in choriocarcinoma, endometrial cancer, [6] prostate cancer and some gastrointestinal malignancies. The presence of cannonball metastases is a hallmark of advanced systemic malignancy. Identification of these lesions often triggers search for primary tumor.
The tumor in the lung is then called metastatic breast cancer, not lung cancer. Metastasis is a key element in cancer staging systems such as the TNM staging system, where it represents the "M". In overall stage grouping, metastasis places a cancer in Stage IV. The possibilities of curative treatment are greatly reduced, or often entirely ...
The incidence of lung cancer is highly correlated with smoking. Tobacco smoking is associated with many forms of cancer, [20] and causes 80% of lung cancer. [21] Decades of research has demonstrated the link between tobacco use and cancer in the lung, larynx, head, neck, stomach, bladder, kidney, esophagus and pancreas. [22]
Lung cancer is responsible for 1.3 million deaths worldwide annually and is the most common cause of cancer-related death in men and the second most common in women. According to the World Health Organization, lung cancer was responsible for approximately 10 million deaths in 2020. [2]
Other causes include radon, exposure to secondhand smoke, exposure to substances such as asbestos, chromium, nickel, beryllium, soot, or tar, family history of lung cancer, and air pollution. [5] [17] Genetics can also play a role as a family history of lung cancer can contribute to an increased risk of developing the disease. [1]
For example, metastatic cancer found in the upper body is more likely to have an origin above the diaphragm, at sites such as the lung and breast. If the metastatic cancer appears first in the lower part of the body, the primary cancer is more likely to be at sites below the diaphragm, such as the pancreas and liver. [9]